用未公开的函数acedSetDynInputDisplayMessage来实现动态显示

csharp

原文见：http://forums.autodesk.com/t5/NET/Dynamic-Input/td-p/1339772
目前AutoCAD未公开实现Dynamic Input的API，要实现和AutoCAD同样的效果，可以使用一个未公开的函数acedSetDynInputDisplayMessage
以下是C#代码：

2. 
   
3. using System;
   
4. using System.Text;
   
5. 
   
6. using Autodesk.AutoCAD.Runtime;
   
7. using Autodesk.AutoCAD.ApplicationServices;
   
8. using Autodesk.AutoCAD.EditorInput;
   
9. using Autodesk.AutoCAD.DatabaseServices;
   
10. 
    
11. using System.Threading;
    
12. using System.Globalization;
    
13. using System.Runtime.InteropServices;
    
14. 
    
15. #endregion
    
16. 
    
17. namespace RSNNAcadApp.Test
    
18. {
    
19. public class Test
    
20. {
    
21. //this is an undocumented api exported from acad.exe. Use it at your
    
22. own risk.
    
23. //
    
24. // Setting this flag tells AutoCAD to display the last string output
    
25. to the command line
    
26. //in the Dynamic Input prompt window (one time only.)
    
27. [DllImport("acad.exe",
    
28. EntryPoint="?acedSetDynInputDisplayMessage@@YA_N_N​@Z")]
    
29. private static extern bool acedSetDynInputDisplayMessage(bool
    
30. displayMessageOnce);
    
31. 
    
32. private double m_dist; //last distance chosen (per-document)
    
33. private bool m_firstTime = true; //first invocation of "test"?
    
34. (per-document)
    
35. //use a non-static command method so the enclosing class (Test) will
    
36. be instantiated
    
37. //for each document
    
38. [CommandMethod("test")]
    
39. public void DoIt()
    
40. {
    
41. Editor ed =
    
42. Application.DocumentManager.MdiActiveDocument.Edit​or;
    
43. PromptDistanceOptions opt1 = new PromptDistanceOptions("Abstand
    
44. zeigen");
    
45. 
    
46. opt1.AllowNegative = false;
    
47. opt1.AllowZero = false;
    
48. opt1.AllowNone = false;
    
49. opt1.UseDashedLine = true;
    
50. if (!m_firstTime)
    
51. opt1.DefaultValue = m_dist;
    
52. 
    
53. 
    
54. PromptDoubleResult res = ed.GetDistance(opt1);
    
55. 
    
56. if (res.Status == PromptStatus.OK)
    
57. {
    
58. m_dist = res.Value;
    
59. ed.WriteMessage(String.Format("Abstand = {0}",
    
60. m_dist.ToString()));
    
61. acedSetDynInputDisplayMessage(true);
    
62. }
    
63. m_firstTime = false;
    
64. }
    
65. void MyPointFilter(object sender, PointFilterEventArgs e)
    
66. {
    
67. e.Result.ToolTipText = String.Format("Abstand = {0}",
    
68. m_dist.ToString());
    
69. }
    
70. }
    
71. }
    

<br /> using System;<br /> using System.Text;<br /> <br /> using Autodesk.AutoCAD.Runtime;<br /> using Autodesk.AutoCAD.ApplicationServices;<br /> using Autodesk.AutoCAD.EditorInput;<br /> using Autodesk.AutoCAD.DatabaseServices;<br /> <br /> using System.Threading;<br /> using System.Globalization;<br /> using System.Runtime.InteropServices;<br /> <br /> #endregion<br /> <br /> namespace RSNNAcadApp.Test<br /> {<br /> public class Test<br /> {<br /> //this is an undocumented api exported from acad.exe. Use it at your <br /> own risk.<br /> //<br /> // Setting this flag tells AutoCAD to display the last string output <br /> to the command line<br /> //in the Dynamic Input prompt window (one time only.)<br /> [DllImport("acad.exe", <br /> EntryPoint="?acedSetDynInputDisplayMessage@@YA_N_N&#8203;@Z")]<br /> private static extern bool acedSetDynInputDisplayMessage(bool <br /> displayMessageOnce);<br /> <br /> private double m_dist; //last distance chosen (per-document)<br /> private bool m_firstTime = true; //first invocation of "test"? <br /> (per-document)<br /> //use a non-static command method so the enclosing class (Test) will <br /> be instantiated<br /> //for each document<br /> [CommandMethod("test")]<br /> public void DoIt()<br /> {<br /> Editor ed = <br /> Application.DocumentManager.MdiActiveDocument.Edit&#8203;or;<br /> PromptDistanceOptions opt1 = new PromptDistanceOptions("Abstand <br /> zeigen");<br /> <br /> opt1.AllowNegative = false;<br /> opt1.AllowZero = false;<br /> opt1.AllowNone = false;<br /> opt1.UseDashedLine = true;<br /> if (!m_firstTime)<br /> opt1.DefaultValue = m_dist;<br /> <br /> <br /> PromptDoubleResult res = ed.GetDistance(opt1);<br /> <br /> if (res.Status == PromptStatus.OK)<br /> {<br /> m_dist = res.Value;<br /> ed.WriteMessage(String.Format("Abstand = {0}", <br /> m_dist.ToString()));<br /> acedSetDynInputDisplayMessage(true);<br /> }<br /> m_firstTime = false;<br /> }<br /> void MyPointFilter(object sender, PointFilterEventArgs e)<br /> {<br /> e.Result.ToolTipText = String.Format("Abstand = {0}", <br /> m_dist.ToString());<br /> }<br /> }<br /> }<br />